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Convert CSV to Parquet Online

Convert CSV data to Apache Parquet in your browser for DuckDB, Python, analytics, and data pipelines without uploading your file.

Quick start

Built for preparing csv data for duckdb, python, analytics, and columnar data pipelines.

Everything runs in your browser, so you can test the workflow with sample data when available before using production files.

Output: An Apache Parquet file generated in a browser worker.

  1. 1Upload a CSV.
  2. 2Review the inferred table columns.
  3. 3Download the Parquet file and use it in your analytics stack.
Preparing your private workspace…

How to CSV to Parquet

  1. 1Upload a CSV file
  2. 2Review the inferred columns
  3. 3Download a Parquet file

Why Use This Tool?

  • ✓Analytics-ready columnar output
  • ✓Runs locally in a worker
  • ✓Works with DuckDB and Python
  • ✓No account required

Frequently Asked Questions

What is Parquet?

Apache Parquet is a columnar file format designed for efficient analytics and data pipelines.

Is my data uploaded?

No. Conversion runs locally in your browser worker.